Botany 120 Biome and genetics review

Genetics

1. How is a phenotype different from a genotype?

2. How is the law of segregation different from the law

of independent assortment?

3. What is an allele?

4. If a pair of alleles are the same we call this

genotype _____,and if the alleles are different

the genotype is called _____.

5. In four o'clock flowers, the petal color is either red,

pink, or white. How do you think flower color

is inherited and why?

6. A gene that is only expressed if it is in the homozygous

condition must be a ______ gene.

7. In a certain species of flower there are two petal colors,

blue or red.If two blue flowered plants are crossed,

the offspring are always blue.If two red plants are crossed,

sometimes only red flowering plants are produced, while

other times both red and blue flowering plants are

produced. If a red plant and blue plant are crossed,

sometimes the offspring are all red, while other

times both red and blue offspring

are produced. Which color is dominant?

8. A plant that breeds true for tall is crossed with one that

breeds true for short. All of the offspring in the F-1 are tall.

The F-1 generation is allowed to self-fertilize, and the

F-2 are 3/4 tall and 1/4 short.

a. which allele is dominant, the one for tallness or shortness?

b. what is the genotype of an F-1 individual?

c. what are the genotypes of the parental generation?

9. In peas, purple flowers (P) are dominant to white flowers (p),

and yellow seeds are dominant (Y) to green(y). If two plants

heterozygous for both traits are crossed, what proportion

of the offspring will have purple flowers and

produce green seeds?

10. Which of the following are homozygous

genotypes?

a. AABb

b. aabb

c. AaBb

d. aaBB

e. Aabb

Biomes

1. What are two important factors in determining what

type of Biome one will find in a given area?

2. What causes the seasons here in North America?

3. What are three strategies plants have developed to survive

in the cold dry,and sometimes dark conditions of the Tundra?

4. What is a rain shadow, and how does it account for different

plant communities occurring at the same latitude, but on

opposites sides of a mountain range?

5. In what biomes does fire play an important role, and

what is this role?

6. To what kind of environmental stresses are the plants

in the chaparral adapted?

7. How is a deciduous forest different from a coniferous

forest, other than the types of trees found in each?

8. Why don't grasslands become forests?

9. What is the one thing all deserts have in common?